If by chambered you mean a hollow core surfboard with balsa vertical sections sandwiched between outer skins akin to model airplane wing construction, then why not score modeling balsa?

Large scale sections of end-grain balsa core prepared for layup in yacht building applications can be expensive and hard to come by however any close-by RC airplane hobby supply shop will have 3 mm X 10 cm X 100 cm balsa for a fair price.

Prepare your own balsa stringer material in advance of the layup by sectioning the balsa, flip the sections on end grain, butt-joint the sections on edge and use a light glass over the surface to form an end grain strip of balsa the length of your board.

While that is curing, prepare your board skins against a mold face.

When the balsa/glass stringer material is cured, use a utility knife to cut your end grain stringers, arrange atop a skin and epoxy in place.Close the construction with the other skin, clean it up then ride it.

You don't want to build solid balsa cores this way but for hollow core/chambered construction of any kind, this works beautifully at a reasonable cost.This same method is the basis for the Trashmanian Devil skate decks built for years with corrugated paper (cardboard shipping boxes) .By the way, when building garbage core surf boards, pre epoxy prior to finishing to keep your paper from mushing after the inevitable leaks show up.

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